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EDWARD M. ALLEN, or -DARLINGT'ON MARYLAND.

Letters Patent No. 76,135, dated lifareh 31, 1868.

IMPROVEMET IN HARVESTER-GUTTBRS.

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TO ALL WHOM IT MAY CONGERN:

Be it known that I, EDWARD M. ALLEN, of Darlington, in the county of Harford, and in the State of Maryland, have invented certain new and useful Improvements in'Mode of Attaching the Knives to Cutter-Bars on I-Iarvesters; and do hereby declare that the following is a full, clear, and exacedescription thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

In the annexed drawings, making part-of this specification, A represents a portion of a cutter-bar of n. reaping or mowing-machine, anClB represents a knife or cutter which is secured to it. fr 'f The invention in this case relates to the Lnode of securing this knife to the cutter-bar, which is electetl as follows: I cut a broad groove crosswise of the bar A, said groove to be equal in depth ,tothe thickness of .the knife, anda little shorter than the knife is broad. The groove may be Inode straightacross the bar, or angling, as isseen in Figure 3, from at' to a', but is made dove-tailed or V-shapel. The edge of the sides at the rear end of the knife is made to correspond with the shape of the groove in the bar, being also fl0ve-tailed like the groove. This knife being slightly wider than the groove is long, is inserted in the groove by springing or bending the knife by any suitable instrument until it is suiliciently contracted toentcr the groove. removed, so that the knife will straighten and fit tightly within the groove.

I use an instrument, which is here represented, which hears upon the knife atl three points upon its upper face, and two upon its lower face, so that it may have its centre at its rear enrlsprung upward suieiently to allow its edges to enter the groove.

"he instrument is then I do not propose to confine myself t0 the shape of groove or shape of knife, as a variety of forms wil answer the purpose. I may use any kind of instrument for bending or springing the knife which will be suitable.

What I claim as new, and desire to secure by Letters Patent, isi Securing knives to cutter-bars of reapers or mowers, by means ofthe elasticity of said knives,'substantially as and for the pnrposeset forth. I i

In'testimony that I clairn the foregoing, I have hereunto set rny hand, this 30th (lay of January, 1868.

ED WARD M. ALLEN.

Witnesses A. N. MARR, A. A. YEATMAN. 

